E-invoicing is a business reform which requires significant changes to be made to ERP systems including billing systems and other allied business processes.
In this regard, GSTN recently issued API version 1.02 along with release notes which included generation of e-way bill as part of Invoice Reference Number (IRN) generation and validations applied for generation of IRN, generation of e-way bill and cancellations. However, there are other aspects relating to generation of invoices which require more clarity..
Source: nasscom.in
